Subj : Re: question about javascript functions
To   : netscape.public.mozilla.jseng
From : Béatrice Philippe
Date : Mon Feb 21 2005 10:27 am

Well, if i try to change a user javascript function, then i can't use 
js_evaluate() anymore (i can use js_evaluate only if nothing is changed by 
my C++ application).
so what i have to do is calling the modified function with 
js_callFunctionValue() and to perform this, i must know wich arguments i 
have to give to the function (my c++ app scans all javascript functions in 
the web page, so it doesn't know what kind of function it's scanning).
I had a look in js_convert...() : i think it's not the right way to give 
arguments to js_callFunctionValue().
I'll try  js_valueto...()  function ....

Thanks.
Béatrice.
"Matthew Mondor" <mm_lists@pulsar-zone.net> a écrit dans le message de news: 
mailman.1108764480.605.mozilla-jseng@mozilla.org...
> On Wed, 16 Feb 2005 15:43:19 +0100
> "Béatrice Philippe" <beatrice.derbez.bd@wanadoo.fr> wrote:
>
>> Thank you Matt, you are right !!
>> with js_enumerate in c++, we can retrieve all parameter names of the
>> function (parameters appear at the top of the enumeration).
>> Now, i just need to give parameter values to my
>> js_callFunctionValue(). I think js_convert() should be
>> the right solution ?!
>
> Hmm I'm not sure I understand...  So you obtain the arguments and their
> types of a user created function, using JS_Evaluate(), so that you can
> then call that user/script function with the proper arguments from C?
>
> I guess that JS_ConvertArguments() could serve perhaps, if it's what you
> meant, but the arguments are simply passed as an array of jsval, of
> course (argv) with the number of elements of the array in argc.  It
> appears that in javascript the value types can easily be converted as
> well automatically in many cases...  This is also true with SpiderMonkey
> when using JS_ValueTo*() functions rather than strict JSVAL_IS_*()
> followed by conditional JSVAL_TO_*() macros (which are probably good for
> performance and to ensure proper types though).
>
> Also, you can attempt to call a JS function from C which is assumed to
> have been defined with the expected arguments.  Very possibly there is a
> simple way to then detect if the function wasn't declared as it had to
> be when doing so (I would have to write a little test and see to confirm
> this though).
>
> Sorry if I'm way off, I couldn't clearly understand the question
>
> Matt

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